EP2727693A1 - Procédé de fabrication de préformes en fibres - Google Patents

Procédé de fabrication de préformes en fibres Download PDF

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Publication number
EP2727693A1
EP2727693A1 EP12191274.5A EP12191274A EP2727693A1 EP 2727693 A1 EP2727693 A1 EP 2727693A1 EP 12191274 A EP12191274 A EP 12191274A EP 2727693 A1 EP2727693 A1 EP 2727693A1
Authority
EP
European Patent Office
Prior art keywords
strand
fiber
fiber bundles
producing
depositing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12191274.5A
Other languages
German (de)
English (en)
Other versions
EP2727693B1 (fr
Inventor
Markus Schneider
Björn Lehmhaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teijin Carbon Europe GmbH
Original Assignee
Toho Tenax Europe GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to PL12191274T priority Critical patent/PL2727693T3/pl
Application filed by Toho Tenax Europe GmbH filed Critical Toho Tenax Europe GmbH
Priority to ES12191274.5T priority patent/ES2531582T3/es
Priority to EP12191274.5A priority patent/EP2727693B1/fr
Priority to US14/438,162 priority patent/US10059042B2/en
Priority to KR1020157011257A priority patent/KR102091993B1/ko
Priority to AU2013339697A priority patent/AU2013339697B2/en
Priority to CN201380057515.9A priority patent/CN104768725B/zh
Priority to PCT/EP2013/071259 priority patent/WO2014067763A1/fr
Priority to RU2015116163A priority patent/RU2632298C2/ru
Priority to CA2888951A priority patent/CA2888951C/fr
Priority to BR112015008233-5A priority patent/BR112015008233B1/pt
Priority to JP2015540088A priority patent/JP6195933B2/ja
Priority to TW102138438A priority patent/TWI597155B/zh
Priority to ARP130104027A priority patent/AR093349A1/es
Publication of EP2727693A1 publication Critical patent/EP2727693A1/fr
Application granted granted Critical
Publication of EP2727693B1 publication Critical patent/EP2727693B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/08—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • B29B11/16—Making preforms characterised by structure or composition comprising fillers or reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/04—Feeding of the material to be moulded, e.g. into a mould cavity
    • B29C31/042—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds
    • B29C31/044—Feeding of the material to be moulded, e.g. into a mould cavity using dispensing heads, e.g. extruders, placed over or apart from the moulds with moving heads for distributing liquid or viscous material into the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • B29D99/0078—Producing filamentary materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/305—Spray-up of reinforcing fibres with or without matrix to form a non-coherent mat in or on a mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/38—Automated lay-up, e.g. using robots, laying filaments according to predetermined patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • B29C70/545—Perforating, cutting or machining during or after moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform

Definitions

  • the present invention relates to a method of producing a fiber preform by depositing reinforcing fiber bundles on a surface and / or on the surface deposited reinforcing fiber bundles.
  • the invention further relates to a method for producing a fiber composite component using a fiber preform produced in this way.
  • Fiber composites often offer the advantage over metal of lower weight and / or higher strengths.
  • the volume fraction of the reinforcing fibers and in particular the orientation of the reinforcing fibers have a significant influence on the load capacity of the components, especially with regard to their rigidity and their strength.
  • highly resilient material and components must still be able to be produced inexpensively to be economically attractive.
  • fiber preforms are first produced from reinforcing fibers in an intermediate step.
  • These are textile semi-finished products in the form of two- or three-dimensional structures of reinforcing fibers, wherein the shape already can almost correspond to the shape of the final component.
  • a suitable matrix material is introduced into the fiber preform in further steps by infusion or injection, also by using vacuum. Finally, the matrix material is cured at generally elevated temperatures and pressures to the finished component.
  • LM process liquid molding
  • RVARTM Vacuum Assisted Resin Transfer Molding
  • RRI Resin Film Infusion
  • LRI Liquid Resin Infusion
  • RIFT Resin Infusion Flexible Tooling
  • the fiber material used for the production of the fiber preforms may also already be preimpregnated eg with small amounts of a plastic material, ie a binder material, in order to improve the fixation of the reinforcing fibers in the fiber preform.
  • a plastic material ie a binder material
  • composite components are produced from fiber preforms which already have a sufficient content of matrix material for the composite component.
  • these fiber preforms can be pressed directly into the component, for example in a mold using increased pressure and / or elevated temperature.
  • a vacuum bag into which the fiber preform is introduced and, after applying a vacuum and as a rule at elevated temperature, is pressed to the component.
  • the content of matrix material which is sufficient for the component can be achieved, for example, by producing the fiber preform from reinforcing fiber bundles which have been produced from prepregs with a corresponding matrix content.
  • additional matrix material for example, be sprayed on the shelf.
  • Fiber preforms can be produced, for example, by spraying and dispersing short-cut reinforcing fibers together with a binder material on an air-permeable screen adapted to the shape of the desired fiber preform and holding them on the screen while applying vacuum, until sufficient stability of the preform has been achieved after cooling of the binder material.
  • a method is used, for example, in WO 98/22644 described.
  • the reinforcing fibers are preferably arranged as short cut fibers in random, isotropic arrangement and orientation. According to the examples of WO 98/22644 Only fiber volume fractions in the range up to about 15 vol .-% can be achieved, and thus only comparatively low thickness-related component strengths due to the low fiber volume fractions.
  • the short-cut fibers in the form of bundles of reinforcing fibers, wherein the fiber bundles preferably have a length in the range from 10 to 50 mm have.
  • this material has no or only a few areas with an increased proportion of resin and thus reduced reinforcing fiber content, which can lead to weak points in the component. It is readily apparent that the use of bundles of reinforcing fibers with such low titers, ie with such low filament numbers, leads to increased costs, in particular because of the use of relatively high-priced starting materials. On the other hand, the use of coarse-denier fiber bundles, ie of fiber bundles with a high number of reinforcing fiber filaments, is less expensive, but, as stated, high fiber volume fractions are thus difficult or impossible to realize.
  • Such coarse denier reinforcing fiber yarns may be first separated into a plurality of sub-strands along the extension of the reinforcing yarn filaments constituting the yarns by means of the longitudinal severing device, the individual sub-strands then having a reduced number of filaments compared to the starting yarn.
  • reinforcing fibers used in the process according to the invention which form the at least one ribbon-like strand, are preferably carbon, glass or aramid fibers or mixtures of these fibers with each other or with thermoplastic fibers used. Particularly preferred are carbon fibers.
  • the at least one endless ribbon-shaped strand of binder-provided reinforcing fibers is a filament yarn having a filament count of at least 12,000 filaments laid in a ribbon form. Particularly preferred are such filament yarns having a filament count in the range of 24,000 to 50,000 filaments.
  • the concentration of the binder in a preferred embodiment is in the range of 2 to 14% by weight and in a particularly preferred embodiment in the range of 3 to 7% by weight. %, based on the total weight of the binder-provided filament yarn.
  • the binder can then be a fiber preparation, as is commonly applied to the filaments of the filament yarn, to a To achieve improved processability and a good fiber closure, ie at least partially connecting the filaments with each other.
  • Such preparations are often based on epoxy resins.
  • an increased content compared with the concentrations of the preparation usually used is required, which, as stated, is preferably in the range from 2 to 14% by weight and more preferably in the range from 3 to 7% by weight on the total weight of the binder-provided filament yarn.
  • Suitable binders here are thermoplastic or unhardened or partially cured thermoset polymers or also polymer compositions made from these polymers.
  • Suitable thermoplastic polymers are, for example, polyethyleneimine, polyetherketone, polyetheretherketone, polyphenylene sulfide, polysulfone, polyethersulfone, polyether ether sulfone, aromatic polyhydroxyethers, thermoplastic polyurethane resins or mixtures of these polymers.
  • Suitable uncured or partially cured thermoset polymers are, for example, epoxides, isocyanates, phenolic resins or unsaturated polyesters.
  • the endless ribbon-like strand of reinforcing fibers provided with a binder is a filament yarn which is not tacky at the processing temperature in the region of the deposition head, ie generally at room temperature and can be unwound, for example, from a bobbin.
  • the binder (s) provided with the binder should be tacky and result in good adhesion of the fiber bundles made therefrom.
  • Such reinforcing fiber yarns or strands of reinforcing fibers are used in the WO 2005/095080 whose disclosure is expressly referred to here.
  • the filament yarns there are infiltrated with a binder composed of several different epoxy resins, these epoxy resins differing in a defined manner with respect to their properties such as epoxy value and molecular weight and with respect to their concentration.
  • the at least one strand is a preimpregnated filament yarn and the binder is comprised of a first and a second resin composition, wherein the filaments of the filament yarn are impregnated with a first resin composition and at least partially bonded via the first resin composition;
  • Resin composition contains at least two bisphenol A epichlorohydrin resins H1 and H2 in a weight ratio H1: H2 of 1.1 to 1.4, wherein H1 has an epoxide value of 1850 to 2400 mmol / kg, an average molecular weight M N of 800 to 1000 g / Mol and is solid at room temperature and H2 has an epoxide value of 5000 to 5600 mmol / kg, an average molecular weight M N of ⁇ 700 g / mol and is liquid at room temperature, and further contains an aromatic polyhydroxyether P1 which has an acid number of 40 to 55 mg KOH / g and an average molecular weight M N of 4000 b
  • the at least one strand may be a prepreg of unidirectionally extending in the direction of extension of the prepreg and thus arranged in the conveying direction of the prepreg reinforcing fibers.
  • a prepreg is a semifinished product of reinforcing fibers impregnated with a polymeric matrix system.
  • This may be a tow prepreg, ie a single yarn impregnated with a matrix system.
  • it may also be a sheet-like semi-finished product, which consists of juxtaposed parallel to each other and unidirectionally oriented reinforcing fibers, which are impregnated with a matrix system.
  • the matrix system of the binder In the case of using prepregs then the matrix system of the binder.
  • Thermoplastic polymers or uncured or partially cured thermoset polymers or polymer compositions may also be used as the matrix system or binder in these cases, it being possible to make use of the abovementioned polymers.
  • the binder i. the matrix system is present in a concentration in the range of 15 to 70 wt .-%, based on the weight of the prepreg, and in the case that the reinforcing fibers are carbon fibers, particularly preferably in the range of 20 to 60 wt. %.
  • the at least one ribbon-shaped strand of binder-provided reinforcing fibers may be unwound from a package or, in the case of using a prepreg, may be unwound from a roll and fed to the deposition head.
  • the template i. the spool or roller, firmly connected to the storage head, so that during movements of the storage head, the template is carried. This makes it possible to achieve a stable run of the at least one strand.
  • the at least one strand is guided over a laying unit arranged on the laying head, which in Direction of conveyance of the at least one endless ribbon-shaped strand over the depositing head is arranged in front of the first conveyor.
  • a laying unit arranged on the laying head, which in Direction of conveyance of the at least one endless ribbon-shaped strand over the depositing head is arranged in front of the first conveyor.
  • the surface of the bars should advantageously be such that abrasion of the yarn strands passed over them is kept low.
  • recourse can be had to known surfaces and materials.
  • the rods are preferably arranged so that the at least one endless ribbon-shaped strand is guided around the rods at a wrap angle in the region of greater than 20 °.
  • the at least one strand of reinforcing fibers provided with a binder has a strand width of at least 6 mm. It is likewise preferred if the at least one strand has a ratio of its width to its thickness of at least 20.
  • the at least one strand passes through the first conveying device, by means of which a defined conveying speed of the at least one strand is set and through which the at least one strand is fed to the longitudinal separating device.
  • the at least one strand is stabilized via suitable means for laterally guiding the at least one strand of reinforcing fibers in the direction transverse to the conveying direction, so that it is guided straight and without lateral deflections through the individual conveying and separating devices.
  • suitable means for laterally guiding the at least one strand of reinforcing fibers in the direction transverse to the conveying direction so that it is guided straight and without lateral deflections through the individual conveying and separating devices.
  • This makes it possible to achieve a clean cut in the longitudinal separating device with clean cut edges, since the cut can be made at least substantially parallel to the filaments of the at least one strand.
  • rods, rollers, rollers or other guide means and optionally the conveying means are at right angles to the conveying direction of the at least one ribbon-shaped strand and parallel to each other aligned.
  • rods, rollers, rollers and other guide elements over which the at least one ribbon-shaped strand is guided be formed spherically at the respective contact points with the strand.
  • the contour of the guide elements in the region of the crown has a radius in the range of 50 to 600 mm.
  • the at least one strand of reinforcing fibers is guided under tension through the laying device and, in particular, a stress build-up takes place in the at least one strand of reinforcing fibers between the first and the second conveying device.
  • This makes it possible to achieve a safe hold flat and a good spread of the at least one strand of reinforcing fibers and a stable run of the at least one strand of reinforcing fibers, which favors in particular a good cutting result in the longitudinal separator.
  • This can be achieved, for example, in that the speeds of the first and the second conveyor are adjusted so that the speed of the second conveyor is higher than that of the first conveyor.
  • the at least one strand of the longitudinal separator is fed under a yarn tension in the range of 40 to 300 cN per mm strand width.
  • the first and / or second conveyor means passed through by the at least one strand consists, in an advantageous embodiment, of one or more driven rollers or rollers, by means of which the at least one strand is transported.
  • the rollers or rollers can be arranged relative to one another in such a way that, in use, the at least one strand of reinforcing fibers wraps around the rollers or rollers.
  • the first and / or second conveying device comprises a driven and controllable in its speed pair of rollers with an adjustable between the rollers of the roller pair Nip through which is promoted due to the pressure exerted by the pair of rollers, the at least one strand of reinforcing fibers.
  • the first and / or second conveying device may comprise a blower device by means of which the at least one endless ribbon-shaped strand of reinforcing fibers is conveyed.
  • the blower device is coupled with a controllable air supply.
  • the at least one strand is cut into partial strands along its longitudinal extent.
  • the partial strands thus obtained preferably have a width in the range from 0.5 to 5 mm and particularly preferably in the range from 0.5 to 3 mm.
  • the longitudinal separating device comprises at least one separating element for separating the at least one strand of reinforcing fibers along its longitudinal extent.
  • the at least one separating element of the longitudinal separating device may be at least one laser beam, one air jet or a water jet arrangement or a mechanical separating element, for example in the form of at least one stationary element, for example a fixed knife, or also in the form of at least one rotating cutting disc. which is preferably driven.
  • the drive can be controlled and designed so that a differential speed between the peripheral speed of the at least one cutting disc and the conveying speed of the longitudinal separator passing through at least one strand of reinforcing fibers can be adjusted.
  • the direction of rotation of the at least one rotating cutting disc can be in the conveying direction of the at least one ribbon-shaped strand or opposite thereto be.
  • the peripheral speed of the at least one separating disk is higher by 2 to 15% than the conveying speed of the at least one strand passing through the longitudinal separating device.
  • a peripheral speed of the at least one cutting wheel which is higher by 4 to 10% than the conveying speed of the at least one strand.
  • the at least one separating element is a mechanical separating element
  • the at least one strand and the at least one separating element are pressed against one another by means of a force-controlled hold-down device with a defined force.
  • the rotating cutting disc be connected to a force-controlled hold-down means, by means of which the rotating cutting disc is pressed with a defined force against the to be separated along its longitudinal extent at least one strand of reinforcing fibers.
  • the at least one strand is pressed by the holding-down device against the at least one mechanical separating element.
  • the at least one strand of reinforcing fibers provided with a binder in the longitudinal separating device can be cut into more than two partial strands.
  • the number of filaments in the individual strands can be reduced so far that fiber bundles are obtained with sufficiently narrow width.
  • the use of such fiber bundles with smaller width turn can be realize higher fiber volume fractions in the fiber preform produced therewith or in the resulting composite component.
  • the number of dividing elements of the longitudinal separator then depends on the number of partial strands that are to be obtained.
  • the at least one strand is cut into sub-strands of different widths.
  • the at least one separating element can thus be arranged relative to the means for laterally guiding the at least one endless ribbon-shaped strand of reinforcing fibers so that the at least one strand is divided centrally or eccentrically into sub-strands.
  • the plurality of separation elements may be arranged relative to each other and / or relative to the lateral guide means such that different width sub-strands result.
  • a plurality of endless ribbon-like strands of reinforcing fibers provided with a binder are presented and fed to the depositing head or to the devices arranged thereon, such as inter alia the longitudinal separating device and the cutting unit.
  • the strands can be the same or different.
  • all of the multiple strands may be strands of carbon fibers.
  • the longitudinal separating device In the case of feeding a plurality of strands of binder-provided reinforcing fibers to the deposition head, there are then several templates, for example in the form of a creel, and a corresponding number of means for laterally guiding the individual strands.
  • the plurality of strands can be guided so that they are arranged side by side, wherein the individual strands may be spaced apart from each other or even touching can lie together.
  • the longitudinal separating device then comprises a plurality of separating elements, the number of which depends on the number of partial strands which are to be produced from the juxtaposed several strands of reinforcing fibers.
  • the longitudinal separating device has four separating elements if two juxtaposed ribbon-shaped yarn strands are each to be cut into three partial strands.
  • the ribbon-like strands can be cut together by the same separation elements in the longitudinal direction.
  • the longitudinal severing device then has two separating elements.
  • the cutting unit After cutting the at least one strand of reinforcing fibers into sub-strands, these sub-strands are fed to the cutting unit by means of the second conveying device.
  • the partial strands obtained in the longitudinal separator are then cut transversely to their extension direction to fiber bundles defined length, ie a previously set length, the length of the resulting fiber bundles depends on the frequency at which the cuts transverse to the direction of extension of the sub strands in dependence the conveying speed to be performed, ie the frequency of cross-cutting.
  • the cutting unit is coupled to the conveyors so that when changing the conveying speed, the frequency of the transverse cutting is changed so that the length of the resulting reinforcing fiber bundles remains the same.
  • the frequency of the transverse cutting adjustable independently of the conveying speed, so that at a constant conveying speed different lengths of reinforcing fiber bundles can be produced.
  • the conveying speed serves as a manipulated variable for the frequency of the transverse cutting, but at a set conveying speed, the frequency of cross-cutting can be varied.
  • the length of the fiber bundles can be varied during the implementation of the method according to the invention and, for example, adapted to contour conditions of the fiber preform to be produced.
  • the frequency of cross cutting over time is varied to vary the length of the fiber bundles.
  • the partial strands are cut by means of the cutting unit so that the resulting fiber bundles have a length in the range of 10 to 100 mm. Particularly preferred is a length of the fiber bundles in the range of 10 to 75 mm.
  • aggregates are, for example, aggregates for water or air jet cutting of fibers, for cutting fibers by laser beams, units with eg pneumatically driven impact knives transverse to the conveying direction, rotary cross cutter with knife roller and counter-roller or rotary cutter in question, the axis of rotation in the conveying direction of the sub-strands or at an angle of up to 60 °, preferably up to 20 ° thereto.
  • the latter rotary cutting knives for example, in the DE 20 2010 017 556 U1 or the EP-A-2 351 880 disclosed.
  • the partial strands are cut into fiber bundles by means of a rotary cross cutter, in which the knives are pressed against the at least one strand of reinforcing fibers to be cut, without exerting a substantial counterpressure on the other side of the strand.
  • This procedure leads to brittle Reinforcing fibers, such as carbon fibers or glass fibers, to a brittle fracture at the point of loading and thus to a clean cut of the strand of reinforcing fibers.
  • Such aggregates are eg in the EP-A-1 144 738 , of the EP-A-1 394 295 , of the EP-A-1 723 272 or the WO 02/055770 described, whose relevant disclosure content is expressly incorporated by reference.
  • the resulting fiber bundles are transported away by means of a device for removing the fiber bundles from the cutting device.
  • a device for removing the fiber bundles from the cutting device This can e.g. done by means of a short conveyor belt.
  • the fiber bundles are transported away from the cutting unit via the nozzle channel of a nozzle head acted upon by compressed air.
  • a Venturi nozzle for introducing the compressed air is arranged in the nozzle channel in the nozzle channel of the nozzle head.
  • the nozzle head for removing the fiber bundles can have means for introducing matrix material into the nozzle channel.
  • particulate matrix material can be introduced into the nozzle channel, which are discharged together with the cut fiber bundles over the nozzle head and discharged or sprayed onto the surface and / or the fiber bundles deposited on the surface.
  • the means for introducing matrix material may, for example, be a Venturi nozzle which projects into the nozzle channel and is introduced into the nozzle channel via the matrix particles. However, it can also be a spray nozzle arranged in the nozzle channel, by means of which liquid matrix material is sprayed.
  • the feeding of matrix material may be advantageous in order to better deposit the fiber bundles produced by means of the laying device onto a surface through the matrix material Adhering together and thus a better fixation of the fiber bundles with each other and on the surface to effect.
  • matrix material in the amount required for the production of a composite component can already be supplied during the production of the fiber preform.
  • the binder provided with the fiber bundles and / or the matrix material can be activated, i. into a sticky state, e.g. by heating the fiber bundles to a temperature above the melting point of the binder.
  • the heating can be effected, for example, by blowing with hot air or by a heated ambient air, by laser radiation or by infrared radiation.
  • particulate or droplet-shaped matrix material can also be sprayed separately from the fiber bundles, but simultaneously with these onto the surface and / or onto the fiber bundles deposited on the surface.
  • This can be done for example by surface-directed spraying of such particles or droplets by a heat source such as a flame or a microwave or infrared field.
  • a heat source such as a flame or a microwave or infrared field.
  • a thermal spraying process such as in the WO 98/22644 or in the US 2009/0014119 A1 is described.
  • a cooling step subsequent to the deposition of the fiber bundles is advantageous for stabilizing the fiber preform.
  • the reinforcing fiber bundles are deposited on a surface and / or on the surface deposited reinforcing fiber bundles and fixed on the surface and / or on the surface deposited reinforcing fiber bundles to form the fiber preform.
  • the surface i. the storage surface, already a contour which is adapted to the contour of the fiber preform to be produced or of the fiber composite component to be produced therefrom.
  • the surface or depositing surface may be a perforated screen on which the fiber bundles are optionally deposited with the simultaneous addition of matrix material or onto which they are sprayed.
  • a fixing of the fiber bundles can be at least assisted by applying a vacuum to the side of the screen facing away from the side of the screen on which the fiber bundles are deposited. In this way, air is sucked through the screen, whereby the fixation of the fiber bundles can be achieved.
  • the surface may also be provided with a previously applied and sticky binder or matrix material during deposition, thereby providing adhesion to the fiber bundles. Adhesion may also be effected by simultaneously adding matrix material together with the fiber bundles through this matrix material.
  • the method of the step of depositing the reinforcing fiber bundles is followed by a compacting step in which the deposited reinforcing fiber bundles are compacted to obtain a higher fiber volume fraction.
  • This compacting step can be carried out so that the preform obtained after depositing the fiber bundles is exposed in a mold, preferably at elevated temperature, to an elevated pressure, for example in a press.
  • the preform obtained after depositing the fiber bundles can be packed in a vacuum bag and the compaction then carried out under vacuum and at elevated temperature.
  • the deposition head is connected to a controllable positioning unit, by means of which the deposition head is moved relative to the surface.
  • the storage head can be connected via a kink arm located on a machine base and can be positioned in at least two axes relative to the surface by means of the kink arm and a robot joint held by the kink arm.
  • the storage head can be fastened via a joint head in a gantry frame and can be positioned relative to the surface by at least two axes.
  • the storage head is positionable in at least 6 and more preferably at least 9 axes.
  • the surface on which the fiber bundles are deposited, fixed and the relative movement between the storage head and the surface is effected by a movement or positioning of the storage head.
  • the surface on which the fiber bundles are stored for example, be moved over a kink arm robot and the storage head firmly.
  • mixed forms of the present method are also included, in which, for example, the surface is moved by a kink arm robot about 6 axes, for example, and the storage head can also be positioned, for example by 3 axes.
  • a composite component can be prepared via the aforementioned process steps by direct compression, without the supply of further matrix material is required if the fiber preform used was prepared by the novel process using a prepreg as at least one strand of binder-provided reinforcing fibers and the prepreg had a matrix or binder content above about 25% by weight.
  • the production of the composite component by direct compression is possible, although it was assumed in the manufacture of the fiber preform of ribbon-like strands of binder provided with reinforcing fibers, in which the concentration of the binder comparatively low and for the production of a component with a continuous matrix phase was not sufficient, but additional matrix material was supplied before the fiber bundles were deposited or when the fiber bundles were deposited.
  • the time for compression under pressure and / or vacuum and at elevated temperature depends in particular on the type of matrix material. If the matrix material is a thermoplastic polymer or a mixture of thermoplastic polymers, the times for pressing can be kept relatively short. For binders and / or matrix materials based on uncured or partially cured thermoset polymers, the time required for compression depends on the times required to cure the matrix.
  • a fiber preform in which the fiber bundles have a relatively low binder content, for example in the range of 2 to 14 wt .-%, based on the binder-provided reinforcing yarn, and the binder eg is based on uncured or partially cured thermoset polymers or resins, according to the aforementioned method for infusion or injection of matrix material for the production of the composite component still required matrix material can be introduced into the forming device before then pressing under pressure and / or Vacuum and carried out at elevated temperature to the component.
  • a laying device is optimally suitable, as described below with reference to the schematic representation in FIG. 1 to be explained:
  • FIG. 1 shows a schematic representation of a segment of a laying device, in which the storage head 1 is connected via a hinge 2 with a controllable positioning unit 3.
  • the storage head 1 present two templates 4 for coils 5 are connected as means for providing the ribbon-like strands 6 of provided with a binder reinforcing fibers, which are preferably driven by means of control motors.
  • the connection between storage head 1 and templates can be done via suitable brackets (not shown here).
  • ribbon-like strands 6 are unwound from provided with a binder reinforcing fibers and guided around a width roller 7, which is preferably carried out crowned.
  • the width roller 7 By means of the width roller 7, the strands 6 are spread and optionally spread.
  • On the spherical design of the width roller 7 can be effected at the same time a lateral guidance of the strands 6.
  • the strands 6 are fed to a first conveyor 8, which in the depositing device in FIG. 1 consists of a driven pair of rollers.
  • the lower roller 9 is pressed by means of a tensioning device 10 against the upper roller 11 provided with a rubber coating, so that a promotion of the strands 6 can take place without slippage.
  • the strands 6 are fed to the longitudinal separator 12, in which the strands 6 are cut into partial strands 13 along their direction of extent.
  • an arrangement of several rotating cutting wheels 14, against which the strands to be separated 6 are pressed by means of two force-controlled hold-down rollers 15 with a defined force.
  • the partial strands 13 obtained in the longitudinal separator 12 are fed to the second conveyor 16, which is likewise designed as a driven pair of rollers.
  • the second conveyor 16 By setting a speed difference between the second conveyor 16 and the first conveyor 8, in which the conveying speed of the second conveyor 16 is set slightly higher than that of the first conveyor 8, a defined voltage can be applied to the strands 6 and the sub-strands 13, whereby an improved Cutting result in the longitudinal separator 12 is obtained.
  • the lower roller 17 of the second conveyor 16 simultaneously serves as a counter roller of the cutting unit 18, which in the present example is a rotary cross cutter, comprising a knife roller 19 and a counter roller 17.
  • the partial strands 13 are cut into reinforcing fiber bundles or fiber bundles 20 having a defined length.
  • the cut fiber bundles 20 are received by the cutting unit from the nozzle head 21 and sprayed via the pressurized air nozzle duct of the nozzle head 21 at an increased speed on a surface for producing a fiber preform.
  • FIG. 2 shows to illustrate the spatial arrangement in particular of the elements of the storage head in FIG. 1 illustrated segment of a depositing device in a perspective view, wherein like reference numerals in the figures relate to the same elements of the device.
  • FIG. 3 1 shows an embodiment of the device which can be used in the method according to the invention with one located on a machine base 22 Knick-arm robot 23, at the end of a hinge 24 of the storage head 1 is mounted and over which the storage head can be moved in several axes relative to the surface 25 of a molded body used for producing a fiber preform.
  • the fiber bundles 20 obtained on the storage head 1 by means of the longitudinal separating device 12 and the cutting unit 18 and discharged via the nozzle head 21 can be sprayed onto the surface 25 in defined paths according to the requirements of the structure of the fiber preform to be produced or of the composite component to be produced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Robotics (AREA)
  • Reinforced Plastic Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Nonwoven Fabrics (AREA)
EP12191274.5A 2012-11-05 2012-11-05 Procédé de fabrication de préformes en fibres Active EP2727693B1 (fr)

Priority Applications (14)

Application Number Priority Date Filing Date Title
ES12191274.5T ES2531582T3 (es) 2012-11-05 2012-11-05 Procedimiento para fabricar preformas fibrosas
EP12191274.5A EP2727693B1 (fr) 2012-11-05 2012-11-05 Procédé de fabrication de préformes en fibres
PL12191274T PL2727693T3 (pl) 2012-11-05 2012-11-05 Sposób wytwarzania tabletek z włókien
BR112015008233-5A BR112015008233B1 (pt) 2012-11-05 2013-10-11 Métodos para produzir uma pré-forma de fibra e para produzir um componente compósito de fibra
AU2013339697A AU2013339697B2 (en) 2012-11-05 2013-10-11 Method for producing fibre preforms
CN201380057515.9A CN104768725B (zh) 2012-11-05 2013-10-11 用于制造纤维型坯的方法
PCT/EP2013/071259 WO2014067763A1 (fr) 2012-11-05 2013-10-11 Procédé de production d'ébauches en fibres
RU2015116163A RU2632298C2 (ru) 2012-11-05 2013-10-11 Способ изготовления волокнистых заготовок
US14/438,162 US10059042B2 (en) 2012-11-05 2013-10-11 Method for producing fiber preforms
KR1020157011257A KR102091993B1 (ko) 2012-11-05 2013-10-11 섬유 프리폼들을 제조하기 위한 방법
JP2015540088A JP6195933B2 (ja) 2012-11-05 2013-10-11 繊維プリフォームを製造する方法
CA2888951A CA2888951C (fr) 2012-11-05 2013-10-11 Procede de production d'ebauches en fibres
TW102138438A TWI597155B (zh) 2012-11-05 2013-10-24 纖維預製件之製造方法
ARP130104027A AR093349A1 (es) 2012-11-05 2013-11-04 Metodo para producir preformas de fibra

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EP12191274.5A EP2727693B1 (fr) 2012-11-05 2012-11-05 Procédé de fabrication de préformes en fibres

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EP2727693A1 true EP2727693A1 (fr) 2014-05-07
EP2727693B1 EP2727693B1 (fr) 2015-01-14

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US (1) US10059042B2 (fr)
EP (1) EP2727693B1 (fr)
JP (1) JP6195933B2 (fr)
KR (1) KR102091993B1 (fr)
CN (1) CN104768725B (fr)
AR (1) AR093349A1 (fr)
AU (1) AU2013339697B2 (fr)
BR (1) BR112015008233B1 (fr)
CA (1) CA2888951C (fr)
ES (1) ES2531582T3 (fr)
PL (1) PL2727693T3 (fr)
RU (1) RU2632298C2 (fr)
TW (1) TWI597155B (fr)
WO (1) WO2014067763A1 (fr)

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JP2008254191A (ja) * 2007-03-30 2008-10-23 Honda Motor Co Ltd 炭素繊維複合材料製造装置、これを用いた炭素繊維複合材料製造方法および炭素繊維複合材料
WO2011045171A2 (fr) 2009-10-12 2011-04-21 Robert Bosch Gmbh Double pompe à engrenages intérieurs
DE202010017556U1 (de) 2010-09-16 2012-01-30 Schmidt & Heinzmann Gmbh & Co. Kg Faserschneidvorrichtung
WO2012072405A1 (fr) 2010-12-02 2012-06-07 Toho Tenax Europe Gmbh Préforme fibreuse comprenant des rubans de fibres unidirectionnels et composée de faisceaux de fibres de renforcement, et élément en matériau composite

Cited By (6)

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EP3153307A1 (fr) * 2015-10-05 2017-04-12 Airbus Defence and Space GmbH Montage par couche d'un corps fibreux
US10286613B2 (en) 2015-10-05 2019-05-14 Airbus Defence and Space GmbH Layered construction of a fibrous body
CN111936281A (zh) * 2018-04-04 2020-11-13 三菱化学株式会社 纤维增强树脂成型材料的制造方法和纤维增强树脂成型材料的制造装置
CN111936281B (zh) * 2018-04-04 2022-04-29 三菱化学株式会社 纤维增强树脂成型材料的制造方法和纤维增强树脂成型材料的制造装置
US12023876B2 (en) 2018-04-04 2024-07-02 Mitsubishi Chemical Corporation Method for producing fiber-reinforced resin molding material, and apparatus for producing fiber-reinforced resin molding material
WO2020212087A1 (fr) 2019-04-18 2020-10-22 Teijin Carbon Europe Gmbh Préforme de remplissage cunéiforme

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WO2014067763A1 (fr) 2014-05-08
CN104768725A (zh) 2015-07-08
EP2727693B1 (fr) 2015-01-14
AR093349A1 (es) 2015-06-03
US10059042B2 (en) 2018-08-28
JP6195933B2 (ja) 2017-09-13
KR20150081277A (ko) 2015-07-13
RU2015116163A (ru) 2016-12-27
BR112015008233A2 (pt) 2017-07-04
CA2888951C (fr) 2020-10-27
PL2727693T3 (pl) 2015-05-29
US20150273736A1 (en) 2015-10-01
AU2013339697B2 (en) 2017-07-06
BR112015008233B1 (pt) 2021-07-20
ES2531582T3 (es) 2015-03-17
JP2015534914A (ja) 2015-12-07
CA2888951A1 (fr) 2014-05-08
TW201429694A (zh) 2014-08-01
KR102091993B1 (ko) 2020-03-23
RU2632298C2 (ru) 2017-10-03
AU2013339697A1 (en) 2015-04-23
TWI597155B (zh) 2017-09-01
CN104768725B (zh) 2016-11-23

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